Remember to use the changelotzoning cheat so you can use the build mode; save the lot, then exit the lot. Don't forgot to change the lot back to a hotel after you fix it.
Actually, you're better off using the dormbuild cheat -- there's apparently things that can go wrong wiht the changelotzoning trick, but the dormbuild cheat works just fine with hotels (I guess they borrowed a lot of the dorm code for them), and is probably safer.